RFR: 8081824: Remove dead code GetPublicJREHome in the launcher

[Kumar Srinivasan]

Hello,

Please review the removal of launcher/windows/registry dead code,
the details of which are in the bug report.
https://bugs.openjdk.java.net/browse/JDK-8081824

The webrev:
http://cr.openjdk.java.net/~ksrini/8081824/webrev.00/

Thanks
Kumar